o4 Scientific Intelligence. 



5. On the supposed new Hydrocarbon., C^H^.—A short time 

 ago Pinner described * a new hydrocarbon obtained by the ac- 

 tion of sodium upon diehlorallylene, to which he assigned the for- 

 mula CgH^. Furtlier investigation has shown him that the for- 

 mula is more probably C3H4 and that the body in question is 

 either allylene itself or an isomer of it. Assuming diehlorallylene 

 to be CalijClg, the action of a molecule of sodium upon one mole- 

 cule of it would be C3H2CI2 + Na2=(NaCl)2 + Cgllg; but if C3H, 

 IS produced, two stages of the reaction are required; C,H,CL + 

 (Na),=(NaCl),.f C^H,!^^^ and C3H,Xa,-f (H,0),=:(NaOH), 

 + ^s\^i- In the former case the resulting aqueous solution must 

 contain chlorine and sodium in atomic proportions ; in the latter, 

 the sodium is double the chlorine. While more alkali than chlorine 

 was always found, it was far from being twice the quantity. To 

 solve the problem, therefore, the author analyzed carefully the tri- 

 bromide. While CgtlBrg requires 13-0 per cent C and 0-4 per 

 cent H, CgHaBrg requires 12-9 per cent C and 1-1 per cent H. In 

 two analyses the carbon was 13-02 and 12-91, and the hydrogen 

 1-15 and 1-17 percent. These results, which contradict the for- 

 mer ones, led the author to examine more carefully the composi- 

 tion of diehlorallylene. He finds that instead of its beino- CJl^Cl-^ 



momzes both the above observations and settles the l.,. ... 

 carbon as C 3 H^. Hence the product of the action of chlorine u 

 aldehyde is not crotonyl chloral, but butyl chloral ; though t 

 It, however, crotonic acid has been obtained by Saraow. ' 

 l^oblem, Pinner is now occupied in solving.— yien Berl C) 

 Ges., viii, 1282, Nov., 1875. ^ G. F. 



6. On Aromatic Compounds containing Arsenic— ^licux 

 . ^.^P'^^^i?^'^ a preliminary note upon phenyl-arsenous chloi 



AsClgCgH,, which he obtained by the action of arsenous chlo 

 upon raercury-diphenyl, in a sealed tube at 170°. The reactio 

 given as follows : 



Hg(CJi J, + (AsCl3),=HgCl, + (AsCl,C,H,),. 

 It 18 a heavy, colorless, strongly refractive liquid, slowlv 

 composed by water. Inv --'^ -• . . -^ , ' - 



gous metallic derivatives a 

 viii, 1316, Nov., 1875. 



7. On Diacetone-alcohol. — Heixtz, who has been recently in- 

 vestigating the amines derived from acetone by the action of am- 

 monia, has examined diacetonamine, to see whether the reaction 

 with Its nitrite would result, as is general with other amines, in 

 the production of an alcohol ; the nitrogen of both being elimi- 

 nated as gas, and hydroxyl taking the place of amido-en. 

 Diacetonamine oxalate was dissolved in three times its woiolit of 

 hot water, and cooled to 5°. To the liquid kept constanth' stir- 

 red, potassium nitrite was gradually added, in amount equal t^. 



* Abstract in this Journal III. x. 293. Ontobftr l ST.f; 



